Final answer:
Unmodified tools are not invisible in the archaeological record as evidenced by various tool types found by archaeologists. The statement on natives being slaughtered is an oversimplification, and the assumption that theories become laws over time is incorrect, as theories and laws serve different purposes in science.
Step-by-step explanation:
The statement that unmodified tools are invisible in the archaeological record is false. Archaeological finds, including stone tools or indications of their usage, like holes for tree-limb scaffolding, provide evidence of early human activities and ingenuity. Furthermore, the discovery of fossilized pollen in archaeological sites has helped scientists learn about the environment during the time of human occupation. Tools from different periods of prehistory, such as the Upper Paleolithic, are often categorized by various industries like the Aurignacian and Magdalenian, known for their specific tool types, including the burin. Acheulean tools, known for their hand-axed shape formed by careful chipping of stones, provide further evidence that unmodified tools can indeed leave a trace in the archaeological record.
For the majority of the natives killed during the exploration period by Europeans, it is false that they were all slaughtered. While European colonization led to significant native population decline due to various factors, including disease and armed conflict, the blanket statement is inaccurate as it ignores the complexity of those historical events.
Lastly, the belief that a theory becomes a law when it has been known for a long time is also false. Scientific laws and theories serve different purposes: laws describe observed phenomena, while theories explain why those phenomena occur. It is the weight of evidence, not the length of time, that supports the validity of a scientific theory.